Hammer head



FIG. 1 is a right side elevational view of the hammer head showing my new design, the broken line showing of the handle is for illustrative purposes only and forms no part of the claimed design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a bottom perspective view thereof. 

The ornamental design for a hammer head, as shown and described. 